1 + 2 + 3 + 4 + ------ + 18 = কত?

A 168

B 171

C 174

D 176

Solution

Correct Answer: Option B

1+2+3+4+.............+18=?


সমষ্টি = n(n+1)/2  [এখানে n=18]
         =9×19
        =171

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